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4 Forerunner 405CX Owner’s Manual
Getting Started
Step 2: Charge the
Battery
Your Forerunner ships with the
power off to conserve the battery.
Charge the Forerunner for at least
3 hours before using it. The length
of time a fully charged battery will
last depends upon usage. For more
battery information, see page 40.
NOTE: To prevent corrosion,
thoroughly dry the charging
contacts and surrounding area
before charging.
TIP: The Forerunner will
not charge when outside the
temperature range of 32°F–122°F
(0°C–50°C).
1. Plug the USB connector on the
charging clip cable into the AC
adapter.
2. Plug the AC adapter into a
standard wall outlet.
3. Align the charging clip posts with
the contacts on the back of the
Forerunner.
Contacts
4. Clip the charger securely over the
face of the Forerunner.
Charging
clip